Please report all spam threads, posts and suspicious members. We receive spam notifications and will take immediate action!
Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 29

Thread: homemade LED's




  1. #11
    Join Date
    Jan 2003
    Posts
    282

    Default

    thats the calc, as for the wattage, i think you can work it out by puttin the volts and amps into some kind of formula....

    //alias
    <hr width="60%"><center>P4 2GHZ @ 2.26 w/ 512 L2 Cache | 512MB PC2100 Ram | Gigabyte 8IEXP MoBo | GeForce 4 MX440 64mb<br>40GB 7200 Segate HDD | 16X Pioneer DVD ROM | 40X12X48 Liteon CD Writer<br>
    <img src="http://forums.tweaktown.com/attachment.php?s=&postid=150040"><br> <br>
    <a href="http://www.alias-kane.tk">alias-kane.tk</a>
    </center>

  2. #12
    Join Date
    Sep 2002
    Posts
    1,636

    Default

    Volts * amps = Watts
    if you have 5 volt, 30mA led, use a 1/2W resitor, assuming its a 240-270Ohm resistor.

  3. #13
    Join Date
    Aug 2002
    Location
    Santa Cruz, CA
    Posts
    232

    Default

    cool, thanks--I'll let you know how it goes...
    <table width=\"500\" height=\"140\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\"><tr><td width=\"163\" bgcolor=\"#FFFFFF\"><font face=\"Verdana, sans-serif\" size=\"1\">&lt;strong&gt;:: Tim''s Rig ::&lt;/strong&gt;</font></td>
    <td width=\"163\" bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"163\" height=\"25\"></td>
    <td width=\"23\" bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"23\" height=\"25\"></td><td width=\"151\" background=\"http://www.bluespherestudios.com/images/case1.gif\" align=\"center\"><font face=\"Verdana, sans-serif\" size=\"1\">Chieftec Blue Case</font></td>
    </tr><tr><td bgcolor=\"#f3f3f4\"><font face=\"Verdana, sans-serif\" size=\"1\">Asus A7V333
    Athlon XP2500+

    Thermaltake Volcano 7+
    PC 2700 DDR@1 GB

    MSI G4 Ti4200 TP64
    Detonator Drivers 53.03
    </font></td><td bgcolor=\"#f3f3f4\"><font face=\"Verdana, sans-serif\" size=\"1\">Seagate 60GB 7200rpm

    Seagate 80GB 7200rpm

    Optorite 4x DVD+/-RW

    Sony 16x DVD

    Sony Floppy!

    Fans@2 intake, 3 exhaust</font></td><td bgcolor=\"#f3f3f4\"><img src=\"http://www.bluespherestudios.com/images/case4.gif\" width=\"23\" height=\"82\"></td><td><img src=\"http://www.bluespherestudios.com/images/case2.gif\" width=\"150\" height=\"82\"></td></tr>
    <tr><td bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"163\" height=\"25\"></td><td bgcolor=\"#FFFFFF\" align=\"right\"><a href=\"http://www.bluespherestudios.com\"><img src=\"http://www.bluespherestudios.com/images/bsslogo.gif\" width=\"115\" height=\"19\" border=\"0\"></a></td>
    <td bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"23\" height=\"33\"></td><td><img src=\"http://www.bluespherestudios.com/images/case3.gif\" width=\"151\" height=\"33\"></td>
    </tr></table>

  4. #14
    Join Date
    Sep 2002
    Posts
    1,636

    Default

    Here's a thought:
    If you are going to be hooking up more than one LED to the same switch (or on all the time), you could actually connect 2 (5v) LED in series to the 12v source. they will be brighter too. Or you could connect 3(5v) to make them a little dimmer.
    NO RESISTORS REQUIRED!!!!!!!

    Same can be done w. 2v LEDs I have 5 hooked up in my car to light up the dash when i want to. Looks nice too.

    BTW the best color the i've found is white! They are kinda rare, t last time i got them i didnt get many. :(
    HTH

  5. #15
    Join Date
    Aug 2002
    Location
    Santa Cruz, CA
    Posts
    232

    Default

    here's the beginning of my homemade on/off switch for my cathode light (soon to be lightS)
    <table width=\"500\" height=\"140\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\"><tr><td width=\"163\" bgcolor=\"#FFFFFF\"><font face=\"Verdana, sans-serif\" size=\"1\">&lt;strong&gt;:: Tim''s Rig ::&lt;/strong&gt;</font></td>
    <td width=\"163\" bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"163\" height=\"25\"></td>
    <td width=\"23\" bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"23\" height=\"25\"></td><td width=\"151\" background=\"http://www.bluespherestudios.com/images/case1.gif\" align=\"center\"><font face=\"Verdana, sans-serif\" size=\"1\">Chieftec Blue Case</font></td>
    </tr><tr><td bgcolor=\"#f3f3f4\"><font face=\"Verdana, sans-serif\" size=\"1\">Asus A7V333
    Athlon XP2500+

    Thermaltake Volcano 7+
    PC 2700 DDR@1 GB

    MSI G4 Ti4200 TP64
    Detonator Drivers 53.03
    </font></td><td bgcolor=\"#f3f3f4\"><font face=\"Verdana, sans-serif\" size=\"1\">Seagate 60GB 7200rpm

    Seagate 80GB 7200rpm

    Optorite 4x DVD+/-RW

    Sony 16x DVD

    Sony Floppy!

    Fans@2 intake, 3 exhaust</font></td><td bgcolor=\"#f3f3f4\"><img src=\"http://www.bluespherestudios.com/images/case4.gif\" width=\"23\" height=\"82\"></td><td><img src=\"http://www.bluespherestudios.com/images/case2.gif\" width=\"150\" height=\"82\"></td></tr>
    <tr><td bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"163\" height=\"25\"></td><td bgcolor=\"#FFFFFF\" align=\"right\"><a href=\"http://www.bluespherestudios.com\"><img src=\"http://www.bluespherestudios.com/images/bsslogo.gif\" width=\"115\" height=\"19\" border=\"0\"></a></td>
    <td bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"23\" height=\"33\"></td><td><img src=\"http://www.bluespherestudios.com/images/case3.gif\" width=\"151\" height=\"33\"></td>
    </tr></table>

  6. #16
    Join Date
    Aug 2002
    Location
    Santa Cruz, CA
    Posts
    232

    Default

    ...and what it looks like with the light on:

    nothing special, but I've got plans :D
    <table width=\"500\" height=\"140\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\"><tr><td width=\"163\" bgcolor=\"#FFFFFF\"><font face=\"Verdana, sans-serif\" size=\"1\">&lt;strong&gt;:: Tim''s Rig ::&lt;/strong&gt;</font></td>
    <td width=\"163\" bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"163\" height=\"25\"></td>
    <td width=\"23\" bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"23\" height=\"25\"></td><td width=\"151\" background=\"http://www.bluespherestudios.com/images/case1.gif\" align=\"center\"><font face=\"Verdana, sans-serif\" size=\"1\">Chieftec Blue Case</font></td>
    </tr><tr><td bgcolor=\"#f3f3f4\"><font face=\"Verdana, sans-serif\" size=\"1\">Asus A7V333
    Athlon XP2500+

    Thermaltake Volcano 7+
    PC 2700 DDR@1 GB

    MSI G4 Ti4200 TP64
    Detonator Drivers 53.03
    </font></td><td bgcolor=\"#f3f3f4\"><font face=\"Verdana, sans-serif\" size=\"1\">Seagate 60GB 7200rpm

    Seagate 80GB 7200rpm

    Optorite 4x DVD+/-RW

    Sony 16x DVD

    Sony Floppy!

    Fans@2 intake, 3 exhaust</font></td><td bgcolor=\"#f3f3f4\"><img src=\"http://www.bluespherestudios.com/images/case4.gif\" width=\"23\" height=\"82\"></td><td><img src=\"http://www.bluespherestudios.com/images/case2.gif\" width=\"150\" height=\"82\"></td></tr>
    <tr><td bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"163\" height=\"25\"></td><td bgcolor=\"#FFFFFF\" align=\"right\"><a href=\"http://www.bluespherestudios.com\"><img src=\"http://www.bluespherestudios.com/images/bsslogo.gif\" width=\"115\" height=\"19\" border=\"0\"></a></td>
    <td bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"23\" height=\"33\"></td><td><img src=\"http://www.bluespherestudios.com/images/case3.gif\" width=\"151\" height=\"33\"></td>
    </tr></table>

  7. #17
    Join Date
    Dec 2001
    Posts
    320

    Default

    ah LEDs i u should always have a resistor plugged with an LED just cause it will protect the LED from being Burnt and it will give u the best Brightness if u are using a proper resistor i think for 5v we used a 150ohm or 300ohm and that worked well. if u need some formulas for getting what u need Power=Voltage x Current and Voltage = Current x Resistance.

    What u Have
    5mm, 5 volt, 30mA, 300mcd

    this is what u do R=5v/30mA
    R=166.66Ohms

    so use a resistor that is the closest to 167 Ohms so 150Ohms Resistor should do the job, But check the spec sheet that u got with the LEDs and see what is the voltage and current for nominal brightness.

    O also i noticed that u already got some resistors... if u are unable to retrun thouse u can plug them in parallel to get the same effect of a single resistor here is a crappy diagram


    Gah i think the format is a bit messy so i did a pic of it

  8. #18
    Join Date
    Aug 2002
    Location
    Santa Cruz, CA
    Posts
    232

    Default

    that's an idea, although I don't mind buying the right resistor, since they're really cheap.

    ok, now what resistor do I need? when I run the numbers through this site Mr. C posted:
    http://www.bit-tech.net/article/68/

    ...I get 233.3 ohms
    <table width=\"500\" height=\"140\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\"><tr><td width=\"163\" bgcolor=\"#FFFFFF\"><font face=\"Verdana, sans-serif\" size=\"1\">&lt;strong&gt;:: Tim''s Rig ::&lt;/strong&gt;</font></td>
    <td width=\"163\" bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"163\" height=\"25\"></td>
    <td width=\"23\" bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"23\" height=\"25\"></td><td width=\"151\" background=\"http://www.bluespherestudios.com/images/case1.gif\" align=\"center\"><font face=\"Verdana, sans-serif\" size=\"1\">Chieftec Blue Case</font></td>
    </tr><tr><td bgcolor=\"#f3f3f4\"><font face=\"Verdana, sans-serif\" size=\"1\">Asus A7V333
    Athlon XP2500+

    Thermaltake Volcano 7+
    PC 2700 DDR@1 GB

    MSI G4 Ti4200 TP64
    Detonator Drivers 53.03
    </font></td><td bgcolor=\"#f3f3f4\"><font face=\"Verdana, sans-serif\" size=\"1\">Seagate 60GB 7200rpm

    Seagate 80GB 7200rpm

    Optorite 4x DVD+/-RW

    Sony 16x DVD

    Sony Floppy!

    Fans@2 intake, 3 exhaust</font></td><td bgcolor=\"#f3f3f4\"><img src=\"http://www.bluespherestudios.com/images/case4.gif\" width=\"23\" height=\"82\"></td><td><img src=\"http://www.bluespherestudios.com/images/case2.gif\" width=\"150\" height=\"82\"></td></tr>
    <tr><td bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"163\" height=\"25\"></td><td bgcolor=\"#FFFFFF\" align=\"right\"><a href=\"http://www.bluespherestudios.com\"><img src=\"http://www.bluespherestudios.com/images/bsslogo.gif\" width=\"115\" height=\"19\" border=\"0\"></a></td>
    <td bgcolor=\"#FFFFFF\"><img src=\"http://www.bluespherestudios.com/images/spacer.gif\" width=\"23\" height=\"33\"></td><td><img src=\"http://www.bluespherestudios.com/images/case3.gif\" width=\"151\" height=\"33\"></td>
    </tr></table>

  9. #19
    Join Date
    Dec 2001
    Posts
    320

    Default

    hmm ok the 1st question u should ask your self is what Voltage do u want to use??? the 5v or the 12v comming off the psu (i suggest use the 5v), and what is the diode forward voltage on the spec sheet of the LED. also there is a small problem with that calculator its idiot proof and it does not take in Real life situations for example when the Supply voltage = Diode forward voltage u get a R value of 0 this is NEVER used in real life as voltages spikes do occur and a voltage increase over a period of time will break the diode i guess it does not matter if u use cheap red or green or yellow LEDs but if u get into the Rare white or blue ones its a diff story. the reason for the Resisitor is so that the Diode only takes the voltage it needs and the rest is used up in the resistor if the voltage is way too high then u will see smoke come out of the resisitor but the LED will survive. so my final words are if u want to use the calculator online do its not that bad just make sure u have all the right values. :thumb:


    hmm i should not answer things too early in the day there is a mistake the formual i gave u

    its suposed ot be (Supply-Diode voltage)/current
    sorry about that

    and Diode voltage is usually 2.7v just in case u cant find it but i would try to find it somewhere cause it is important

    also going back to my formula its the same thing as the page if Diode forward voltage = supply then R =0 rule that i use if thats the case then stick in a low R value

  10. #20
    Join Date
    Jan 2003
    Posts
    12

    Default

    I'd start with a 390 ohm 1/2 watt resistor and see if that gave me the brightness I wanted. The 233 ohm value assumes that the forward drop across the led is 5 volts, which I think is a shakey assumption.

Page 2 of 3 FirstFirst 123 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •